What Would Cause the Fuel Guage on a 2002 Buick Lesabre to Read Incorrectly

grinder11

Hullo. I'm new to the Forum, but not LeSabre'southward. My '04 has an unusual fuel gauge upshot. When car starts, it goes to Full, then later on a i or 2 miles of driving, it nosedives to EMPTY. After another mile, or less of driving, the depression fuel light so comes on. Happens EVERY TIME Automobile IS STARTED!!! Does Non Affair where the fuel level is. It can be full, half full, 1/4 tank, etc.. Please HELP!!!!

AviatorFrank

The fact that your low fuel lite comes on tells me it'south not the fuel gauge's stepper motor itself but either the sending unit in the tank or a faulty electric connection. This is a fairly mutual problem with these cars. Does your driver info heart (the dot matrix panel under the tach that has the odometer etc) jibe with the fuel estimate? IOW miles to empty etc. If it does the estimate is 100% OK.

DonP

I agree with AviatorFrank - And the most likely crusade is worn "fingers" on the sender unit of measurement in the tank. Many past threads on this topic.

Non a difficult DIY repair, simply some gamble due to open fuel tank during the repair.

Many folks monitor their miles since last fill up-up to estimate remaining fuel until repaired.

gmfugitt

there is an access panel in the torso. The sending unit is fairly piece of cake to get to. on my 2000 they had different sending units for different vins.

grinder11

The fact that your low fuel light comes on tells me it'southward not the fuel gauge's stepper motor itself but either the sending unit in the tank or a faulty electrical connectedness. This is a adequately mutual problem with these cars. Does your commuter info center (the dot matrix panel under the tach that has the odometer etc) jibe with the fuel gauge? IOW miles to empty etc. If it does the gauge is 100% OK.

Yes, the DIC jibes with gauge. A picayune History may aid here: I have an '03 LeSabre, too. Simply-Sadly-As much every bit I loved it, 3 weeks ago I found a DEER who loved it even More!!! It had 398,763 (Yeah-Iii HUNDRED Xc EIGHT THOUSAND, SEVEN HUNDRED SIXTY Three) miles on it! Information technology had the "erratic" fuel estimate problem-Annihilation nether three/8 to a 1/2 tank of gas, and information technology went from total to near empty, so back to 1/2, etc.. I bought this car to supervene upon the '03. Collection it 1 week. On the 8th morning, I went out to commencement it and head to piece of work. I cranked and cranked-Merely it didn't fire one time!! Took 4 days, only I plant the problem: The female person "Tangs" in the the underseat fuse block that hold the 20A Fuse for the Fuel pump were spread open way as well far. Some tweezers and a jewelers screwdriver, presto-The fuel pump was humming again!!! But-As mentioned earlier, now the fuel gauge is non working!!! I've also noticed that the Compressor for the ride level system has not worked since I bought it. BUT-The fuel gauge WAS working before the "loose tang" on the fuse problem reared upwards. This is all very puzzling, as in nearly 400,000 miles of driving my '03, I NEVER had whatsoever of these issues! Delight HELP!!!!!

DonP

The fuel level sender is just a variable resistor (a bit like a volume control on a radio) that is adapted by a bladder in the tank. Information technology is passive and is Non powered by the fuel pump fuse.so the fuse problem should non issue information technology. Y'all can test the gauge circuit (if y'all are comfortable with that level of DIY) without opening the fuel tank past replacing the sender connection with a resistor at the connector at the fuel tank (nether the access encompass in the trunk flooring).

The post-obit are from the FSM and are approximate:
90 ohms for empty, (which besides ways 15% of a tank of fuel remaining)
135 ohms for 1/4
170 ohms for one-half
204 for 3/4
233 for full (which means 90% total or higher)

Note that over time the contacts in the sender unit wear out and no longer make reliable contact - often it is intermittent contact so information technology may work at times.

At that place are two electrical connectors on the fuel pump assembly. One for fuel tank pressure sensor, the other for the fuel level sender and for fuel pump power.

AviatorFrank

As well if yous're replacing the sender do both the pump and sender too. First, they're often sold together anyway and secondly, why get through the job twice. Despite the easy access panel in the trunk there'due south a lock band that's a bit of a fiddle to remove and many people don't like working effectually open fuel vapors and then why not limit the excitement to once instead of twice.

Terrycabral

thou,information technology helped me reinstalling it.I replaced my sons,bought i off ebay for about $fifteen. Information technology has been fine for a year at present. I did non supercede the pump,just the sending unit of measurement. A tip would be to have a pic before you lot remove the assembly from the fuel tanl

grinder11

Give thanks y'all very much. I am somewhat suspicious that I did the impairment somehow, since information technology worked fine before I "fixed" the fuel pump. I did continuity test the harness/pigtails with a meter, and I'm wondering if I may have damaged a pin/socket with a meter probe. Information technology was working fine before the "set up". I did unplug the "weatherpak" harness backside the rear bike on passenger side to help find the fuel pump trouble. Auto seems to take some sort of electric issues. Like the keyless entry flim-flam. Everything on that works. EXCEPT the ruby "horn" button. Also, when unlocking the car afterwards dark, all the external lights come on as they are supposed :-OEXCEPT the headlights!!! These are sorely missed!! They besides worked for a few days, but stopped working before I started checking for the the fuel pump, and so at least I didn't crusade THAT one!!! Seriously, I have had more problems with this automobile in 2 weeks than I did with my old '03 LeSabre in 8 years and 400,000 miles!!!!!

AviatorFrank

Don't you but honey electrical issues? Makes you yearn for the the likes of an old 66 Dart when the entire electrical schematic fit on the back of a business organisation carte du jour.

DonP

Practise the twenty-four hours time running lights work?
How is the key trick bombardment?
I've seen with other devices that a weak battery tin can cause some bug with remote controls where some function may work and other non.

When grounds become bad foreign electrical things start to happen.

grinder11 · Aug 10, 2015

Practise the mean solar day time running lights work?
How is the key fob battery?
I've seen with other devices that a weak bombardment can cause some problems with remote controls where some function may piece of work and other not.
When grounds go bad strange electrical things offset to happen.

Boy, you lot got that right, DonP!! I have a 2000 Corvette. ANYONE...Whos familiar with the Corvette electronics knows that when someone says "I've got a 2000 Corvette", they've said information technology all when it comes to automotive electrical gremlins!! Anyway-Back to the LeSabre....As for the Daytime R.L., I will cheque that out. As for the primal play a trick on battery, it'southward anyone's guess as to it's age. Now, on the top of the fuel tank itself, there are 2 connectors: I believe that the 4 pin plug is for the Fuel pump, and the 3 pin plug is for the Fuel level sender. My question is this: How exercise yous remove the black, 3 pivot Female connector on the top of the tank? I would like to swap information technology out with the one on my '03, which notwithstanding lurks in the lawn. Thx, again.

AviatorFrank

The iv-pin plug is 2 for the pump and 2 for the sender. The three-pin is for a pressure sensor.

grinder11

The 4-pin plug is 2 for the pump and two for the sender. The 3-pin is for a pressure sensor.

Thank y'all for clarifying that. I stand corrected. Would you happen to know which is which? Meaning what colour are the two wires for the sender, and what color for the pump? Thank you very much.

grinder11

I am also wondering: How many other people take experienced problems with the air compressor for the air shocks/ride level? This air compressor was never was an issue on my '03 in almost 400,000 miles!! Thank you for all your assist.

AviatorFrank

EDIT:

The grayness wire is +12V fuel pump, from the fuel pump relay located in the fusebox under the rear seat. The black is fuel pump ground. The other ii are the gauge sender, according to my 2005 schematic.

jerreich

You probably have a worn out fuel guage sending unit, which is fastened to the fuel pump, a very common problem with these cars. You can replace the unit, or the complete pump. This is accessed thru a hole in the trunk floor, nigh the front correct side of the body floor, no need to drop the tank. Mine has been that way for years. I just fill up up every 300-350 miles. These pumps are almost bullet proof, just not the sending unit.

grinder11

Do the day time running lights piece of work?
How is the key play tricks battery?
I've seen with other devices that a weak battery can cause some issues with remote controls where some function may work and other not.
When grounds become bad foreign electric things first to happen.

To answer your question: Yes-The Daytime Running Lts.
(DRL) WORK FINE. The headlights work properly under the normal situtions that they should: They come up on automatically after dark, and they volition come on manually using the switch. Seem to work in every situation EXCEPT when you unlock the car with the keyless play a trick on when it's dark!! VERY FRUSTRATING!!!!

grinder11

Y'all probably have a worn out fuel guage sending unit, which is attached to the fuel pump, a very common trouble with these cars. You lot can supplant the unit, or the complete pump. This is accessed thru a hole in the trunk floor, almost the front end right side of the trunk floor, no need to drop the tank. Mine has been that manner for years. I just fill up every 300-350 miles. These pumps are almost bullet proof, only not the sending unit.

You may be right regarding the sending unit. Only that would certain is coincidental. I mentioned earlier that I had an '03 model (still do-wrecked-only runs fine) that never have me these same issues. Only trouble I had with fuel gauge Sender was effectually 275,000 miles, when information technology started interim similar the typical sender problem others hither have mentioned. Gauge was reading fine until it neared a half tank. Them it would start going dorsum towards Full again. Then back downwards towards half full, then upwardly again, etc. VERY erratic. My '04 has not-thus far-done this. When you offset it, no matter what the true fuel level is, it goes upward to Full for a mile or so, then nosedives to EMPTY and won't motion again until you shut off the engine, and re-first the machine.

What Would Cause the Fuel Guage on a 2002 Buick Lesabre to Read Incorrectly

'04 LeSabre "UNUSUAL" fuel guess reading.......

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